Then you restore the stack frame and return.
之后再恢复堆栈框架并返回。
The prologue sets up the stack frame for the function.
序言为函数设置堆栈框架。
For right now, just know that it sets up the stack frame.
就目前而言，只需知道它将设置堆栈框架就可以了。
LR_OFFSET is the offset into the stack frame of the return address.
LR_OFFSET是返回地址的堆栈框架的偏移量。
The first part of the stack frame is the non-volatile register save area.
堆栈帧的第一个部分是非易失性寄存器保存区。
If the stack frame is active, this address is the next instruction to execute.
如果堆栈帧处于活动状态，则此地址是要执行的下一条指令。
If the stack frame is active, this address is the next instruction to execute.
如果堆栈帧处于活动状态，则此地址是要执行的下一条指令。
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